Describes the physical characteristics, habits, and behavior of hummingbirds.

Color photos fill this overview of oil, which describes its origins, its physical makeup, its ancient and modern uses, and its role in the future, and also provides a listing of related books and Web sites

Describes the art styles of the early Renaissance beginning in Italy in the late fourteenth century and spreading throughout Europe to the late sixteenth century.

Describes the physical characteristics, behavior, and life cycle of porcupines.

Discusses the development of reusable spacecraft and how they have been used and describes the typical flight of a space shuttle.

Describes the unique area of Florida known as the Everglades and the plants and animals that are found there.

Describes the physical characteristics, behavior, and life cycles of various beetles.

Explains how lightning forms and the impact it can have.